28272115 has 4 divisors (see below), whose sum is σ = 33926544. Its totient is φ = 22617688.

The previous prime is 28272103. The next prime is 28272137. The reversal of 28272115 is 51127282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51127282 = 2 ⋅25563641.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28272115 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2827207 + ... + 2827216.

It is an arithmetic number, because the mean of its divisors is an integer number (8481636).

Almost surely, 2^28272115 is an apocalyptic number.

28272115 is a deficient number, since it is larger than the sum of its proper divisors (5654429).

28272115 is an equidigital number, since it uses as much as digits as its factorization.

28272115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5654428.

The product of its digits is 2240, while the sum is 28.

The square root of 28272115 is about 5317.1529035754. The cubic root of 28272115 is about 304.6394197988.

Adding to 28272115 its reverse (51127282), we get a palindrome (79399397).

The spelling of 28272115 in words is "twenty-eight million, two hundred seventy-two thousand, one hundred fifteen".